Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ee5bc7376d4900…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 03:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adfeff3befd2380c66dbf25eaac28c17 SHA-1: 93c0e49cb535584990ec85ca888d35d4233b91fb SHA-256: 58ee5bc7376d4900b8f56701554039e71e86e29eb547f5553c344c7153a5662c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=printable+bingo+cards+pdf'. This URL is embedded within the document body, disguised as a link to bingo cards. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=printable+bingo+cards+pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/meeting_schedule_timetable_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/9160/6170/files/kovepoduti.pdf
    • https://cdn.shopify.com/s/files/1/0437/9246/6080/files/45660844276.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/fakegaziz.pdf
    • https://static.usrfiles.com/ugd/5a1791_65c92cf2640e4bf5b972b19a6ea9c0fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca2c50b8336a48feb72c3976f7b9a19c.pdf
    • https://static.usrfiles.com/ugd/856cea_52a5b6964c80476d93c20944d13f99c6.pdf
    • https://static.usrfiles.com/ugd/7f16bd_d0db4eddde9f4b679be9db747cee35a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d92b88587ee450aaaa20a7ded358862.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/29611438143.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/vikefajemaxuz.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/infosys_aptitude_test_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/0969/6156/files/62962570254.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b27.bin
16204c2fe1d09b5c7ff6e045de51c965041c9f45cf8b5b7c0fc5273e15863428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B27 5464 bytes
font_01_sfnt_off00006db5.bin
738086a5c2c6c934c6f226763ed977c57d4696e22559dfc8652b0e0d991636be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 10140 bytes

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